linux-kernel - Re: [PATCH bpf-next] LoongArch, bpf: Set bpf_jit_bypass_spec

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Message-ID: <CAAhV-H6TeZpLyY19xBhVwZbQeH5gQyZZqw_xP2P9rgTyFOiHUw@mail.gmail.com>
Date: Thu, 19 Jun 2025 23:20:11 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, Hengqi Chen <hengqi.chen@...il.com>, bpf@...r.kernel.org, 
	loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next] LoongArch, bpf: Set bpf_jit_bypass_spec_v1/v4()

Queued for loongarch-next, thanks.


Huacai

On Tue, Jun 17, 2025 at 2:32 PM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
>
> JITs can set bpf_jit_bypass_spec_v1/v4() if they want the verifier
> to skip analysis/patching for the respective vulnerability, it is
> safe to set both bpf_jit_bypass_spec_v1/v4(), because there is no
> speculation barrier instruction for LoongArch.
>
> Suggested-by: Luis Gerhorst <luis.gerhorst@....de>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
>
> This is based on the latest bpf-next tree which contains the
> prototype and caller for bpf_jit_bypass_spec_v1/v4().
>
> By the way, it needs to update bpf-next tree before building
> on LoongArch:
>
> [Build Error Report] Implicit Function declaration for bpf-next tree
> https://lore.kernel.org/bpf/d602ae87-8bed-1633-d5b6-41c5bd8bbcdc@loongson.cn/
>
>  arch/loongarch/net/bpf_jit.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c
> index fa1500d4aa3e..5de8f4c44700 100644
> --- a/arch/loongarch/net/bpf_jit.c
> +++ b/arch/loongarch/net/bpf_jit.c
> @@ -1359,3 +1359,13 @@ bool bpf_jit_supports_subprog_tailcalls(void)
>  {
>         return true;
>  }
> +
> +bool bpf_jit_bypass_spec_v1(void)
> +{
> +       return true;
> +}
> +
> +bool bpf_jit_bypass_spec_v4(void)
> +{
> +       return true;
> +}
> --
> 2.42.0
>
>